coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

Maintaining proper coolant levels is one way to keep your car's mechanical components in good shape. — Charles Singh, USA Today, 22 June 2026

Check coolant and brake fluid a few times per year, and monitor tire pressure monthly, especially with seasonal temperature changes. — John Paul Senior Manager Public Affairs and Traffic Safety Aaa Northeast, Hartford Courant, 27 June 2026

The system relies on a liquid coolant made up of 75 percent water and 25 percent propylene glycol, which circulates through cold plates attached to processors. — Georgina Jedikovska, Interesting Engineering, 24 June 2026

This concept proposes removing the rigid radiator structure completely and instead spraying a stream of coolant oil directly into the vacuum of space. — IEEE Spectrum, 11 June 2026

Word History

Etymology

cool entry 2 + -ant entry 1

First Known Use

1915, in the meaning defined above

Rhymes for coolant

• puberulent
• pulverulent

Kids Definition

coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling substance